@BritSocHaem@BuntyStowe@shshsid@h4yder First we talked about blood donation in the UK. All our blood is donated by altruistic donors, most commonly through whole blood donation but 30-40% platelets are donated by apheresis
@BritSocHaem@BuntyStowe@shshsid@h4yder Donors are assessed prior to donation with the Donor Health Questionnaire and a hb check to ensure the donor is safe to donate and the blood is safe to give to patients.
@BritSocHaem@BuntyStowe@shshsid@h4yder Some testing of the donation is mandatory (e.g. HIV, ABO group) and some is discretionary depending on info given by the donor (e.g. malaria for foreign travel) or the destination of the blood (e.g. CMV for IUT).
@BritSocHaem@BuntyStowe@shshsid@h4yder In the transfusion science session we discussed that the ABO blood group is the most important because antibodies are naturally occurring and are IgM, so can activate complement leading to intravascular haemolysis, DIC, renal failure and death
@BritSocHaem@BuntyStowe@shshsid@h4yder The basic transfusion lab test is the “Group and antibody screen” – forward and reverse groups for ABO, forward D group and then screening for patient antibodies to other blood group antigens
@BritSocHaem@BuntyStowe@shshsid@h4yder@swright2909 PBM is an evidence-based, multidisciplinary approach to optimising the care of patients who might need transfusion. I think of it as not using blood for people who don’t need it so it is there for the people who do. This includes lots of blood and quickly in major haemorrhage.
@BritSocHaem@BuntyStowe@shshsid@h4yder@swright2909@PBM_NHS In the Special Requirements session we discussed that irradiated components are given to reduce the risk of transfusion associated GvHD, usually in patients who have impaired T cell immunity or who are receiving a component close in HLA type to their own.
@BritSocHaem@BuntyStowe@shshsid@h4yder@swright2909@PBM_NHS@bbguy .@shshsid, medical director of SHOT, gave a brilliant overview of the organisation. SHOT started in the 1990s as one of the earliest haemovigilance organisations in the world. By reviewing when things go wrong we can work to make things better. A no blame culture is paramount.
@BritSocHaem@BuntyStowe@shshsid@h4yder@swright2909@PBM_NHS@bbguy At the bedside we categorise into mild/moderate/severe to guide what actions are required. Mild reactions are fevers (rise <2 degrees C) or non-urticarial rash, with no other associated features.
@BritSocHaem@BuntyStowe@shshsid@h4yder@swright2909@PBM_NHS@bbguy The most common thing that goes wrong with transfusion is that someone makes an error. The biggest cause of patient morbidity is TACO. The most dangerous complication of transfusion is TA-GvHD (~95% mortality).
I had a personal request to do a tweetorial for the #haemSpRs on haemovigilance. Here goes. A #blooducation 🧵
Haemovigilance is a systematic surveillance of adverse reactions and adverse events related to transfusion’ with the aim of improving transfusion safety. transfusionguidelines.org/transfusion-ha…
We are very lucky in the UK to have @SHOTHV1, one of the first in the world to collate adverse events relating to transfusion - since the 1990s.
This morning I met with the chair and vice chair of the Midlands Regional Transfusion Committee, the Midlands Patient Blood Management Practitioner and the Customer Services Manager. What are their roles and what does the RTC do?
A #blooducation 🧵
RTCs serve to bring together Hospital Transfusion Committees to discuss best practice, implement new guidance and provide educational resources and events. They are run by clinicians and scientists working in hospitals, supported by @NHSBT.
Teaching our incoming haematology doctors today about transfusion in haematology patients. So who needs irradiated blood and why? A #blooducation🧵
All blood in the UK is leucocyte reduced (except granulocytes, but that’s another story). Despite this, a unit of red cells or platelets can have around a million residual white cells, mostly lymphocytes.
Every doctor starting in a new trust does transfusion training as part of their mandatory training. But why?
50ml ABO incompatible blood can kill a patient. ABO antibodies are naturally occurring (“everyone” has them) and they are IgM; they can activate complement and cause *immediate* intravascular haemolysis, causing release of free haem, endothelial activation, renal failure and DIC.
In most hospitals, blood banks require 2 samples (one may be historic) before releasing group specific (non-O) blood for a patient. This is to increase the chances of identifying a *wrong blood in tube* (pt whose blood's in the tube is not the pt whose details are on the outside)
It can be difficult to know where to start with transfusion – you can’t go on a ward round to find patients. BUT you do start with lab induction and your helpful #BMSes will show you around.
Excellent session on emergency paediatric transfusion #AABB20. Cyril Jacquot talking on pre hospital transfusion and summarising the literature.
28 day mortality following haemorrhage is higher in children than adults (unpublished data and substudies from PROPPR and PROMMTT)
Observational studies of large numbers of patients but with only very small numbers of paediatric patients suggest that pre hospital blood is not associated with an excess of transfusion reactions and in some studies is thought to have improved survival.
Whole blood, group O, high titre neg, used in paediatrics in Pittsburgh appears to be safe with no haemolysin-mediated haemoylsis in non group O patients (Leeper et al JAMA Pediatrics 2018) ncbi.nlm.nih.gov/pmc/articles/P…